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Which design pattern defines one-to-many dependency among objects?

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Which design pattern defines one-to-many dependency among objects?

(a) Singleton pattern

(b) Facade Pattern

(c) Observer pattern

(d) Factory method pattern

I had been asked this question in homework.

The question is from Software Design Pattern topic in section Design and Implementation of Software Engineering

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Best answer
Right choice is (c) Observer pattern

To explain: Observer pattern defines one-to-many dependency among objects so that when one object changes its state, all its dependents are notified.

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